|Thermally stable polyimides from solutions of monomeric reactants - Delvigs, P.|
Preparation of thermally stable polyimides from solutions of monomeric reactions
Keywords: INTERPLANETARY COMMUNICATION; INTERPLANETARY FLIGHT; HISTORIES; SPACE NAVIGATION
|Spacecraft navigation - Vorobev, L. M|
Space navigation, spacecraft trajectories, and space vehicle navigation systems
Keywords: NAVIGATION; SPACE NAVIGATION; SPACECRAFT TRAJECTORIES; NAVIGATION SYSTEM; SPACE NAVIGATION; SPACECRAFT TRAJECTORY
|TWO SIGHTING PROBLEMS ASSOCIATED WITH SEXTANT TYPE MEASUREMENTS FOR SPACE NAVIGATION - NON|
Sighting problems associated with sextant type measurement of star position for space navigation
Keywords: POSITION ERRORS; SEXTANTS; SPACE NAVIGATION; STAR TRACKERS; THEODOLITES; POSITION ERROR; SEXTANT; SPACE NAVIGATION; STAR TRACKING
|Second-order perturbation angle techniques for accurately simulating sighting problems of a space sextant - Grover, K. C.|
Simulation of manual control sextant problems in spacecraft navigation using fixed cockpit and analog computer with perturbation angle techniques
Keywords: ANALOG COMPUTERS; COMPUTER SIMULATION; MANUAL CONTROL; SEXTANT; SPACE NAVIGATION; COCKPITS; COMPUTERIZED SIMULATION; MANUAL CONTROL; PERTURBATION; SEXTANTS; SIMULATION; SPACE NAVIGATION; ANALOG COMPUTER
|Space programs summary no. 37-45, volume III FOR the period March 1 to April 30, 1967. The deep space network - NON|
Tracking and navigation analysis, communications development, and facility engineering and operations for deep space network
Keywords: DEEP SPACE INSTRUMENTATION FACILITY; SPACE NAVIGATION; TRACKING STUDY; DEEP SPACE NETWORK; NAVIGATION; SPACE NAVIGATION; SPACE PROGRAMS; TELECOMMUNICATION; TRACKING (POSITION); COMMUNICATION SYSTEM; DEEP SPACE NETWORK /DSN/
|Space programs summary no. 37-31, volume V for the period December 1, 1964 January 31, 1965. Supporting research and advanced development - NON|
No Abstract Available
Keywords: APOLLO PROJECT; SPACE NAVIGATION; SPACECRAFT GUIDANCE; EQUIPMENT SPECIFICATIONS; NAVIGATION AIDS; SPACECRAFT INSTRUMENTS
|The nuclear reactor-thermoelectric power subsystem - Dunlop, J. D|
No Abstract Available
Keywords: APOLLO APPLICATIONS PROGRAM; DIGITAL COMPUTERS; LAUNCH VEHICLES; SATURN PROJECT; SPACE NAVIGATION; SPACECRAFT GUIDANCE
|Tether Technologies for Future Space Applications - Frame, Kyle L.|
This viewgraph presentation provides information on several types of spacecraft tethers, and possible applications for them. The tethers profiled include: 1) Mechanical tethers; 2) Electrodynamic (ED) tethers; 3) Momentum eXchange Electrodynamic Reboost (MXER) tethers; 4) Synergistic technologies. Tethers can have low Earth orbit (LEO), lunar, and interplanetary applications.
Keywords: GRAVITATIONAL FIELDS; PLANETARY CORES; SPACECRAFT TRAJECTORIES; SPACE NAVIGATION; SOLAR SYSTEM EVOLUTION; ELLIPSOIDS; COORDINATES; MOON; SPACE MISSIONS
|Radio-frequency performance of an 85-ft ground antenna - X-band - Bathker, D. A|
Superhigh frequency performance of paraboloidal ground antenna for Deep Space Instrumentation Facility
Keywords: CONSTANTS; ORBIT CALCULATION; SPACE NAVIGATION; TRAJECTORY ANALYSIS; ASTRODYNAMICS; ORBITAL ELEMENTS; TABLES (DATA)
|A critical evaluation of analytic methods for predicting laminar boundary-layer shock-wave interaction - Murphy, J. D|
Critical evaluation of analytic methods of predicting interaction between laminar boundary layer and impinging shock waves
Keywords: DEEP SPACE NETWORK; SPACE NAVIGATION; TROPOSPHERIC SCATTERING; BALLOON SOUNDING; TRACKING STATIONS
|Preliminary scientific instrumentation interface requirements specification - NON|
No Abstract Available
Keywords: APOLLO PROJECT; SPACECRAFT GUIDANCE; NAVIGATION INSTRUMENTS; SPACE NAVIGATION; SYSTEMS ENGINEERING; WEIGHT ANALYSIS
|Specification for display equipment, external visual design control - NON|
No Abstract Available
Keywords: APOLLO PROJECT; LUNAR MODULE; SPACE RENDEZVOUS; SIMULATION; SPACE NAVIGATION; SPACECRAFT GUIDANCE
|Some remotely controlled master-slave manipulator design problems - Lakota, N. A.|
A number of specific requirements for designing remotely controlled master-slave manipulators, including the kinematics and the dimensions of the master and slave members, are presented. General requirements for master-slave manipulator control systems are discussed.
Keywords: EQUATIONS OF MOTION; MARINER SPACECRAFT; SPACE MISSIONS; SPACE NAVIGATION; CELESTIAL NAVIGATION; SPACECRAFT GUIDANCE; SPACECRAFT PERFORMANCE
|Minutes of radar requirements coordination meeting no. 1 between Grumman Aircraft Engineering Corporation /GAEC/ and Massachusetts Institute of Technology /MIT/ - NON|
No Abstract Available
Keywords: APOLLO PROJECT; PROJECT MANAGEMENT; SPACECRAFT GUIDANCE; PRODUCT DEVELOPMENT; SPACE NAVIGATION; SYSTEMS ENGINEERING
|Project Apollo guidance and navigation program Monthly technical progress report, 13 Sep. - 4 Oct. 1961 - NON|
No Abstract Available
Keywords: APOLLO SPACECRAFT; SPACE NAVIGATION; SPACECRAFT GUIDANCE; COMPONENT RELIABILITY; COMPUTER DESIGN; SYSTEMS ENGINEERING
|FORMAC source program generating the equations of motion of the seven element stick man - Hill, J. C|
Computer program for generating motion equations in biocontrol mechanism of robot
Keywords: CELESTIAL MECHANICS; SPACE NAVIGATION; ASTRONOMY; LIBRATION; LUNAR LIMB; LUNAR ORBITS; REFRACTION; STARS
|Effects of practice and work load on the performance of a code transformation task /COTRAN/ - Alluisi, E. A.|
Practice and operator work load effects on acquisition and performance of code transformation /COTRAN/ task
Keywords: GEMINI 12 FLIGHT; SEXTANTS; SPACE NAVIGATION; ASTRONAVIGATION; CELESTIAL NAVIGATION; INTERPLANETARY NAVIGATION; NAVIGATION AIDS
|Technical background, chapter 3, part B - NON|
A description is given of the physics of electromagnetic scattering from the sea and a guideline is presented to relate an observable (such as the radar cross section) to the hydrodynamics or physical properties of the sea. As specific examples of the interdisciplinary science of electromagnetics and geophysical oceanography, the physics is discussed in connection with data provided by three instruments: namely, the scatterometer, the altimeter, and the imaging radar...
Keywords: APOLLO PROJECT; SPACE NAVIGATION; SPACECRAFT GUIDANCE; ELECTROMAGNETIC NOISE; IONOSPHERIC PROPAGATION; MATHEMATICAL MODELS; SPACECRAFT TRACKING
|Two-dimensional duct flow code - Greywall, M. S|
No Abstract Available
Keywords: AEROSPACE ENVIRONMENTS; APOLLO PROJECT; FLIGHT HAZARDS; LUNAR ENVIRONMENT; LUNAR TOPOGRAPHY; METEOROID HAZARDS; SPACE NAVIGATION
|Multispectral techniques for general geological surveys evaluation of a four-band photographic system - Crowder, D., F|
A general geological survey at 1:62,500 scale of the well exposed rocks of the White Mountains and the adjacent volcanic desert plateau is reported. The tuffs, granites, sedimentary rocks and metavolcanic rocks in this arid region are varicolored and conventional black and white aerial photographs have been a useful mapping aid. A large number of true color and false color aerial photographs and multispectral viewer screen images of the study area are evaluated in order to consider what imagery ...
Keywords: AEROSPACE ENGINEERING; DATA PROCESSING; ELECTRONIC EQUIPMENT; THEORETICAL PHYSICS; PHYSICAL CHEMISTRY; SPACE NAVIGATION; SPACECRAFT TRACKING; STATISTICAL ANALYSIS
|Factors affecting the design and use of a photographic sextant for space navigation - Walsh, T. M|
Factors affecting design and use of photographic sextant for space navigation
Keywords: PHOTOGRAPHIC TRACKING; SEXTANTS; SPACE NAVIGATION; NAVIGATION AIDS; PHOTOGRAPHIC FILM; SPACECRAFT POSITION INDICATORS
|Propulsion subsystem. engineering analysis report, Gemini-Agena target vehicle - NON|
No Abstract Available
Keywords: APOLLO PROJECT; SPACE NAVIGATION; SPACECRAFT GUIDANCE; EQUIPMENT SPECIFICATIONS; INERTIAL NAVIGATION; INERTIAL REFERENCE SYSTEMS; SYSTEMS ENGINEERING
|A study of LC-39 cryogenic systems. Part 1: A study of the vacuum insulated transfer lines at Kennedy Space Center. Part 2: Cooldown pressure surges - Ludtke, P. R.|
The vacuum liquid hydrogen and liquid oxygen transfer lines at Kennedy Space Center were studied to evaluate the feasibility of using a condensing gas such as CO2 inside the vacuum spaces to achieve a condensing-vacuum. The study indicates that at ambient temperature, a maximum vacuum hyphen space pressure of 4000 microns is acceptable for the LH2 transfer lines. In addition, the cooldown procedures for the 14-inch cross-country liquid oxygen line was studied using a simplified mathematical mode...
Keywords: ASTRONAVIGATION; INTERPLANETARY NAVIGATION; ORBITAL MECHANICS; SPACE NAVIGATION; NUMERICAL ANALYSIS; SPACE EXPLORATION; TRAJECTORY ANALYSIS
|Shuttle cryogenic supply system optimization study. Volume 5A-1: Users manual for math models - NON|
The Integrated Math Model for Cryogenic Systems is a flexible, broadly applicable systems parametric analysis tool. The program will effectively accommodate systems of considerable complexity involving large numbers of performance dependent variables such as are found in the individual and integrated cryogen systems. Basically, the program logic structure pursues an orderly progression path through any given system in much the same fashion as is employed for manual systems analysis...
Keywords: APOLLO 13 FLIGHT; SPACE NAVIGATION; SPACECRAFT GUIDANCE; SPACECRAFT PERFORMANCE; INERTIAL NAVIGATION; SPACECRAFT COMPONENTS; SYSTEMS ANALYSIS
|Mission-related design requirements for the LEM propulsion subsystem /U/ - Bradley, D. M.|
No Abstract Available
Keywords: APOLLO PROJECT; SPACE NAVIGATION; SPACECRAFT GUIDANCE; EQUIPMENT SPECIFICATIONS; GYROSCOPES; INERTIAL NAVIGATION; QUALITY CONTROL
|In-flight checkout, Project Apollo - Firstman, S. I.|
No Abstract Available
Keywords: APOLLO PROJECT; COMMAND MODULES; SPACECRAFT GUIDANCE; EQUIPMENT SPECIFICATIONS; MANAGEMENT PLANNING; SPACE NAVIGATION; SYSTEMS ENGINEERING
|Space programs summary no. 37-44, volume III FOR the period January 1, 1967 to February 28, 1967. The deep space network - NON|
Tracking and navigation, communications R&D, ground support equipment, and computer programming for deep space network
Keywords: COMMUNICATION EQUIPMENT; COMMUNICATION SYSTEM; COMPUTER PROGRAMMING; DEEP SPACE NETWORK /DSN/; GROUND SUPPORT EQUIPMENT; SPACE NAVIGATION; TRACKING; COMPUTER PROGRAMMING; DEEP SPACE NETWORK; GROUND SUPPORT EQUIPMENT; NAVIGATION; SPACE NAVIGATION; SPACE PROGRAMS; TELECOMMUNICATION; TRACKING (POSITION)
|RF Telemetry System for an Implantable Bio-MEMS Sensor - Simons, Rainee N.|
In this paper, a novel miniature inductor and a pick-up antenna for contact less powering and RF telemetry from implantable bio-MEMS sensors are presented. The design of the inductor and the pick-up antenna are discussed. In addition, the measured characteristics at the design frequency of 330 MHz have been shown.
Keywords: JAMES WEBB SPACE TELESCOPE; AUTONOMOUS NAVIGATION; ONBOARD EQUIPMENT; OPTICAL MEASUREMENT; SPACE NAVIGATION; SOLAR RADIATION; DEEP SPACE NETWORK; LIBRATION
|PSYCHOPHYSIOLOGY: RELATIONSHIPS IN RATS BETWEEN SPEED OF LEARNING AND DURATION OF PARADOXICAL SLEEP DURING THE NYCTHEMERIC CYCLE - DELACOUR, J.|
THE RELATIONSHIPS BETWEEN PARADOXICAL SLEEP AND AVOIDANCE LEARNING IN RATS WERE STUDIED ACCORDING TO A PROCEDURE REDUCING THE DIRECT INTERACTIONS BETWEEN THESE TWO VARIABLES. THE FINDINGS SUGGESTED THE EXISTENCE OF A RELATIONSHIP BETWEEN THE SPEED OF THIS LEARNING AND THE VALUE OF THE DURATION OF PARADOXICAL SLEEP/WAKING PERIOD RATIO DURING THE NYCTHEMERAL CYCLE.
Keywords: AIR NAVIGATION; ATMOSPHERIC ENTRY; SPACE NAVIGATION; SPACE SHUTTLES; SPACECRAFT LANDING; NUMERICAL ANALYSIS; REENTRY PHYSICS; SPACECRAFT PERFORMANCE; TRAJECTORY ANALYSIS
|Inspection with Robotic Microscopic Imaging - Pedersen, Liam|
Future Mars rover missions will require more advanced onboard autonomy for increased scientific productivity and reduced mission operations cost. One such form of autonomy can be achieved by targeting precise science measurements to be made in a single command uplink cycle. In this paper we present an overview of our solution to the subproblems of navigating a rover into place for microscopic imaging, mapping an instrument target point selected by an operator using far away science camera images...
Keywords: SPACE NAVIGATION; SENSITIVITY; QUADRUPOLES; IONS; MERCURY (METAL); CLOCKS; MICROWAVES; ATOMIC BEAMS; ATMOSPHERIC IONIZATION; ZEEMAN EFFECT; ION TEMPERATURE
|Experimental investigation of possible geomagnetic feedback from energetic (0.1 to 16 keV) terrestrial O() ions in the magnetotail current sheet - Lennartsson, O. W.|
Data from energetic ion mass spectrometers on the ISEE 1 and AMPTE/CCE spacecraft are combined with geomagnetic and solar indices to investigate, in a statistical fashion, whether energized O() ions of terrestrial origin constitute a source of feedback which triggers or amplifies geomagnetic activity as has been suggested in the literature, by contributing a destabilizing mass increase in the magnetotail current sheet...
Keywords: APPLICATIONS PROGRAMS (COMPUTERS); CONTROLLERS; FAULT TOLERANCE; SOFTWARE RELIABILITY; SPACE NAVIGATION; SPACECRAFT GUIDANCE; COMPUTER PROGRAMMING; PROGRAM VERIFICATION (COMPUTERS); SPACE STATION FREEDOM
|THE VACUUM-ULTRAVIOLET DEGRADATION OF SALT-SPRAY-CONTAMINATED THERMAL CONTROL COATINGS - KING, H. M.|
AN EXPERIMENTAL PROGRAM IN WHICH SALT-SPRAY-EXPOSED COATINGS HAVE BEEN IRRADIATED IS DESCRIBED AND DISCUSSED.
Keywords: APOLLO 15 FLIGHT; SPACE NAVIGATION; SPACECRAFT CONTROL; SPACECRAFT GUIDANCE; SYSTEMS ANALYSIS; ASCENT TRAJECTORIES; COMMAND SERVICE MODULES; DESCENT TRAJECTORIES; GYROSCOPIC STABILITY
|ON THE OCCURRENCE OF LONGITUDINAL VORTICES IN TURBULENT BOUNDARY LAYERS AT CONCAVE WALLS - SANDMAYR, G|
THE EXISTENCE OF PERIODIC LONGITUDINAL VORTICES IN A TURBULENT BOUNDARY LAYER ALONG A CONCAVE WALL IS INVESTIGATED. IN ADDITION TO THE VELOCITY PROFILE, A PROFILE OF THE EDDY VISCOSITY AND THE REYNOLDS NUMBER ARE GIVEN. THE EIGENVALUE PROBLEM IS APPROXIMATELY SOLVED FOR NEUTRAL DISTURBANCES AND FOR A PARTICULAR BOUNDARY LAYER BY GALERKIN'S METHOD. THE CURVE OF CRITICAL CURVATURE HAS A MINIMUM FOR A CERTAIN WAVELENGTH OF THE DISTURBANCE...
Keywords: AIRGLOW; AUTONOMOUS NAVIGATION; MANNED SPACECRAFT; SPACE NAVIGATION; EARTH ORBITS; SOYUZ SPACECRAFT; U.S.S.R. SPACE PROGRAM
|A program for computing shock-tube gasdynamic properties - Horton, T. E.|
Computer program for calculating chemical equilibrium properties in shock tubes
Keywords: DEEP SPACE NETWORK; RADIO TELEMETRY; SPACECRAFT COMMUNICATION; SYSTEMS ENGINEERING; TRACKING NETWORKS; DATA ACQUISITION; DEEP SPACE INSTRUMENTATION FACILITY; SPACE NAVIGATION
|Advanced rocket engine cooling concept program Final report, Jul. 1968 - Jan. 1969 - Burge, H. L.|
Liquid foam cooling for advanced rocket engines
Keywords: ERROR ANALYSIS; HORIZON SCANNERS; POSITION ERRORS; RANGE ERRORS; SPACECRAFT POSITION INDICATORS; INSTRUMENT ERRORS; INTERPLANETARY FLIGHT; SPACE NAVIGATION
|Statistical properties of high performance cesium standards - Percival, D. B|
The intermediate term frequency stability of a group of new high-performance cesium beam tubes at the U.S. Naval Observatory were analyzed from two viewpoints: (1) by comparison of the high-performance standards to the MEAN(USNO) time scale and (2) by intercomparisons among the standards themselves. For sampling times up to 5 days, the frequency stability of the high-performance units shows significant improvement over older commercial cesium beam standards.
Keywords: FREQUENCY STABILITY; RADIO INTERFEROMETERS; TIME MEASUREMENT; UNIVERSAL TIME; DEEP SPACE NETWORK; EARTHQUAKES; MEXICO; SOUTHERN CALIFORNIA; SPACE NAVIGATION
|FIDDLE: A Computer Code for Finite Difference Development of Linear Elasticity in Generalized Curvilinear Coordinates - Kaul, Upender K|
A three-dimensional numerical solver based on finite-difference solution of three-dimensional elastodynamic equations in generalized curvilinear coordinates has been developed and used to generate data such as radial and tangential stresses over various gear component geometries under rotation. The geometries considered are an annulus, a thin annular disk, and a thin solid disk. The solution is based on first principles and does not involve lumped parameter or distributed parameter systems appro...
Keywords: FORMATION FLYING; ARCHITECTURE (COMPUTERS); ERROR ANALYSIS; SPACE NAVIGATION; GLOBAL POSITIONING SYSTEM; SPACE COMMUNICATION; FEEDBACK CONTROL; SYSTEMS SIMULATION; NAVIGATION INSTRUMENTS; RECEIVERS; PROTOCOL (COMPUTERS)
|Neutrino theory of stellar collapse in type 2 supernova - Chiu, Hong-Yee|
No Abstract Available
Keywords: AUTONOMOUS NAVIGATION; OPERATIONS RESEARCH; SPACECRAFT DESIGN; MISSION PLANNING; NASA PROGRAMS; ORBITAL MECHANICS; RENDEZVOUS GUIDANCE; SPACE NAVIGATION; SPACECRAFT DOCKING; INTERPLANETARY FLIGHT; LUNAR EXPLORATION
|Orbital Spacecraft Consumables Resupply System (OSCRS). Volume 1: Executive summary - NON|
The objective was to establish an earth storable fluid tanker concept which satisfies the initial resupply requirements for the Gamma Ray Observatory (GRO) at a reasonable front end cost while providing growth potential for foreseeable future earth storable fluid resupply mission requirements. The estimated costs required to design, develop, qualify, fabricate, and deliver a flight tanker and its associated control avionics, ground support equipment (GSE), and processing facilities, and the cont...
Keywords: GEODETIC ACCURACY; SPACE NAVIGATION; GLOBAL POSITIONING SYSTEM; ORBIT CALCULATION; PRECISION; SATELLITE NAVIGATION SYSTEMS; EARTH ORBITAL ENVIRONMENTS; NAVIGATION SATELLITES; ORBITAL MECHANICS; REPETITION
|Full Mesh Audio Conferencing Using the Point-to-Multipoint On-Board Switching Capability of ACTS - Rivett, Mary L.|
The purpose of this paper is to describe an implementation of audio conferencing using the ACTS T1-VSAT network. In particular, this implementation evaluates the use of the on-board switching capability of the satellite as a viable alternative for providing the multipoint connectivity normally provided by terrestrial audio bridge equipment The system that was implemented provides full mesh, full-duplex audio conferencing, with end-to-end voice paths between all participants requiring only a sing...
Keywords: CONFERENCES; SPACE FLIGHT; SPACE NAVIGATION; EARTH (PLANET); LIFE SCIENCES; AEROSPACE ENVIRONMENTS; EARTH OBSERVATIONS (FROM SPACE); SPACE EXPLORATION; SPACE STATIONS; SPACECRAFT LAUNCHING; TECHNOLOGY UTILIZATION
|Rotating Molten Metallic Drops and Related Phenomena: A New Approach to the Surface Tension Measurement - Rhim, Won-Kyu|
Molten aluminum and tin drops were levitated in a high vacuum by controlled electric fields, and they were systematically rotated by applying by a rotating magnetic field. When the evolution of the drop shape was measured as a function of rotation frequency, it agreed quantitatively well with the Brown and Scriven's theoretical prediction. The normalized rotation frequencies at the bifurcation point agreed with the predicted value 0.559, within 2%...
Keywords: DEEP SPACE NETWORK; COLLAPSE; LARGE SPACE STRUCTURES; MARS PATHFINDER; MESSAGES; SCHEDULES; SPACECRAFT ORBITS; TELEMETRY; MISSION PLANNING; SCHEDULING; SPACE MISSIONS; SPACE NAVIGATION; SPACECRAFT TRACKING; ANTENNAS; AUSTRALIA; CALIBRATING
|Rockets and People - Chertok, Boris E|
As with Volume I, Boris Chertok has extensively revised and expanded the material in Volume II from the original Russian text. In this volume, Chertok takes up his life story after his return from Germany to the Soviet Union in 1946. At the time, Stalin had ordered the foundation of the postwar missile program at an old artillery factory northeast of Moscow. Chertok gives an unprecedented view into the early days of the Soviet missile program...
Keywords: GLOBAL POSITIONING SYSTEM; EARTH LIMB; RADIO NAVIGATION; SPACE NAVIGATION; ALTITUDE; VELOCITY DISTRIBUTION; POSITION (LOCATION); FIGURE OF MERIT; LOW EARTH ORBITS; SIGNAL TRANSMISSION; SIMULATION
|Supersonic aerodynamic characteristics of a tail-control cruciform maneuverable missile with and without wings - Spearman, M. L|
The aerodynamic characteristics for a winged and wingless cruciform missile configuration were examined. The configuration had an ogive-cylinder body with a 3.5 caliber forebody; an overall length-to-diameter ratio of 11.667; and had cruciform tails that were trapezoidal in planform. Tests were made both with and without 72.9 degree cruciform delta wings. The investigation was made for Mach numbers from 1.50 to 4.63, roll attitudes of 0 degrees and 45 degrees, angles of attack from -4 degrees to...
Keywords: COMMAND AND CONTROL; SPACE NAVIGATION; SPACECRAFT COMMUNICATION; COMMAND GUIDANCE; DEEP SPACE NETWORK; REVISIONS; TELECOMMUNICATION; COMMUNICATION NETWORKS; COMPUTER PROGRAMS; COMPUTERS; REMOTE CONTROL
|Multilevel algorithms for nonlinear optimization - Alexandrov, Natalia|
Multidisciplinary design optimization (MDO) gives rise to nonlinear optimization problems characterized by a large number of constraints that naturally occur in blocks. We propose a class of multilevel optimization methods motivated by the structure and number of constraints and by the expense of the derivative computations for MDO. The algorithms are an extension to the nonlinear programming problem of the successful class of local Brown-Brent algorithms for nonlinear equations...
Keywords: APOLLO PROJECT; SPACECRAFT MANEUVERS; COMMAND SERVICE MODULES; LUNAR LANDING; LUNAR MODULE; LUNAR ORBITS; SPACE NAVIGATION; SPACECRAFT GUIDANCE; DESCENT TRAJECTORIES; ORBITAL MECHANICS
|X-33 Ascent Flight Controller Design by Trajectory Linearization: A Singular Perturbational Approach - Zhu, J. Jim|
The flight control of X-33 poses a challenge to conventional gain-scheduled flight controllers due to its large attitude maneuvers from liftoff to orbit and reentry. In addition, a wide range of uncertainties in vehicle handling qualities and disturbances must be accommodated by the attitude control system. Nonlinear tracking and decoupling control by trajectory linearization can be viewed as the ideal gain-scheduling controller designed at every point on the flight trajectory...
Keywords: ADAPTIVE CONTROL; ROBUSTNESS (MATHEMATICS); VELOCITY DISTRIBUTION; APPROACH CONTROL; CONTROL THEORY; ATMOSPHERIC ENTRY; MARS ATMOSPHERE; MARS (PLANET); MARS LANDING; SPACECRAFT GUIDANCE; SPACE NAVIGATION
|Infrared Spectroscopy of Matrix-Isolated Polycyclic Aromatic Compounds and their Ions - Mattioda, A. L.|
The matrix-isolation technique has been employed to measure the mid-infrared spectra of several polycyclic aromatic nitrogen heterocycles in both neutral and cationic forms. The species studied include: 7,8 benzoquinoline (C13H9N); 2-azapyrene (C15H9N); 1- and 2-azabenz(a)anthracene (C17H11N); and 1-, 2-, and 4-azachrysene (also C17H11N). The experimentally measured band frequencies and intensities for each molecule are tabulated and compared with their theoretically calculated values computed u...
Keywords: AEROCAPTURE; SPACE NAVIGATION; SPACECRAFT GUIDANCE; SYSTEMS ANALYSIS; THERMAL PROTECTION; AEROTHERMODYNAMICS; SPACECRAFT DESIGN; ORBIT INSERTION; SPACECRAFT MANEUVERS; OUTER PLANETS EXPLORERS; TITAN; NEPTUNE (PLANET); SPACECRAFT CONTROL
|Precise timing correlation in telemetry recording and processing systems - Pickett, R. B.|
Independent PCM telemetry data signals received from missiles must be correlated to within or - 100 microseconds for comparison with radar data. Tests have been conducted to determine RF antenna receiving system delays; delays associated with wideband analog tape recorders used in the recording, dubbing and repdocuing processes; and uncertainties associated with computer processed time tag data. Several methods used in the recording of timing are evaluated...
Keywords: LOW THRUST PROPULSION; ORBITAL POSITION ESTIMATION; STATE ESTIMATION; STOCHASTIC PROCESSES; SPACE NAVIGATION; SPACECRAFT GUIDANCE; EQUATIONS OF MOTION; EQUATIONS OF STATE; FEEDBACK; FLIGHT SIMULATION; KALMAN FILTERS; MATHEMATICAL MODELS
|How to help intelligent systems with different uncertainty representations cooperate with each other - Kreinovich, Vladik YA.|
In order to solve a complicated problem one must use the knowledge from different domains. Therefore, if one wants to automatize the solution of these problems, one has to help the knowledge-based systems that correspond to these domains cooperate, that is, communicate facts and conclusions to each other in the process of decision making. One of the main obstacles to such cooperation is the fact that different intelligent systems use different methods of knowledge acquisition and different metho...
Keywords: CHEBYSHEV APPROXIMATION; LOW ALTITUDE; PARKING ORBITS; PERTURBATION; POLYNOMIALS; RADIATION EFFECTS; RADIATION PRESSURE; SOLAR RADIATION; TIME DEPENDENCE; ELLIPTICAL ORBITS; SPACE EXPLORATION; SPACE NAVIGATION; SPACECRAFT TRAJECTORIES; TRAJECTORY ANALYSIS; ALGORITHMS; COSMIC RAYS; LIBRATION
|Segmented back-up bar Patent - Franklin, W. J.|
Segmented back-up bar for butt welding large tubular structures such as rocket booster bodies or tanks
Keywords: AEROSPACE ENGINEERING; MISSION PLANNING; PROPULSION SYSTEM CONFIGURATIONS; RESEARCH AND DEVELOPMENT; SOLAR SIMULATORS; TELECOMMUNICATION; THERMOELECTRIC GENERATORS; AEROSPACE SCIENCES; ASTRIONICS; ROCKET PROPELLANTS; SPACE COMMUNICATION; SPACE MISSIONS; SPACE NAVIGATION; AIRBORNE/SPACEBORNE COMPUTERS; INFRARED DETECTORS
|Parallel PAB3D: Experiences with a Prototype in MPI - Guerinoni, Fabio|
PAB3D is a three-dimensional Navier Stokes solver that has gained acceptance in the research and industrial communities. It takes as computational domain, a set disjoint blocks covering the physical domain. This is the first report on the implementation of PAB3D using the Message Passing Interface (MPI), a standard for parallel processing. We discuss briefly the characteristics of tile code and define a prototype for testing...
Keywords: SPACE EXPLORATION; SPACE NAVIGATION; VENUS FLY TRAP ROCKET VEHICLE; ATMOSPHERIC MODELS; VENUS ATMOSPHERE; NAVIGATION; POSITION (LOCATION); GUIDANCE (MOTION); GEOLOGY; VENUS PROBES; MODELS; ALGORITHMS; HEURISTIC METHODS; SPACE EXPLORATION; ROBOTS; SPACE MISSIONS; STELLAR ATMOSPHERES